High Quality Content by WIKIPEDIA articles! Qal'at Ja'bar is a castle on the left bank of Lake Assad in Ar-Raqqah Governorate, Syria. Once located on a prominent hill-top overlooking the Euphrates Valley, the creation of Lake Assad has turned Qal'at Ja'bar into an island that can only be reached by an artificial causeway. Although the hilltop on which the castle sits was possibly already fortified in the 7th century, the current structures are primarily the work of Nur ad-Din Zangi, who rebuilt the castle from 1168 onwards. Since 1965, several excavations have been carried out in and around the castle, as well as restoration works of the walls and towers. It is not exactly known when the hilltop of Qal'at Ja'bar was first fortified. The site was already known as Dawsar in pre-Islamic times and was located along a route connecting Ar-Raqqah with the west.

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